Unityで作ったゲームをWebGLでビルドしたいがエラーが出る

前提・実現したいこと

Unity初心者です
Unityで作ったゲームをWebGLにビルドしようとしたときに下のような３つのエラーが出ました。
解決方法を教えてください。

発生している問題・エラーメッセージ

Exception: Failed running C:\Program Files\Unity\Hub\Editor\2020.3.4f1\Editor\Data\il2cpp/build/BeeSettings/offline/bee.exe --useprebuiltbuildprogram --no-colors

stdout:
[             ] Require frontend run.  tundra.dag no longer valid. FileSignature timestamp changed: il2cpp_settings.json
[        0s] Executed build program. Created build graph with 3 nodes.
[           0s] Freezing tundra.dag.json into .dag (.dag file didn't exist)
*** Bee build failed (0.03 seconds), 0 items updated, 3 evaluated
stderr:

UnityEditorInternal.Runner.RunProgram (UnityEditor.Utils.Program p, System.String exe, System.String args, System.String workingDirectory, UnityEditor.Scripting.Compilers.CompilerOutputParserBase parser) (at <7587a42c8322471cbc42b27c9b8eab3c>:0)
UnityEditorInternal.Runner.RunManagedProgram (System.String exe, System.String args, System.String workingDirectory, UnityEditor.Scripting.Compilers.CompilerOutputParserBase parser, System.Action`1[T] setupStartInfo) (at <7587a42c8322471cbc42b27c9b8eab3c>:0)
UnityEditorInternal.IL2CPPBuilder.RunIl2CppWithArguments (System.Collections.Generic.List`1[T] arguments, System.Action`1[T] setupStartInfo) (at <7587a42c8322471cbc42b27c9b8eab3c>:0)
UnityEditorInternal.IL2CPPBuilder.ConvertPlayerDlltoCpp (UnityEditor.Il2Cpp.Il2CppBuildPipelineData data) (at <7587a42c8322471cbc42b27c9b8eab3c>:0)
UnityEditorInternal.IL2CPPBuilder.Run () (at <7587a42c8322471cbc42b27c9b8eab3c>:0)
UnityEditorInternal.IL2CPPUtils.RunIl2Cpp (System.String stagingAreaData, UnityEditorInternal.IIl2CppPlatformProvider platformProvider, System.Action`1[T] modifyOutputBeforeCompile, UnityEditor.RuntimeClassRegistry runtimeClassRegistry) (at <7587a42c8322471cbc42b27c9b8eab3c>:0)
UnityEditor.WebGL.WebGlBuildPostprocessor.CompileBuild (UnityEditor.Modules.BuildPostProcessArgs args) (at /Users/bokken/buildslave/unity/build/PlatformDependent/WebGL/Extensions/Unity.WebGL.extensions/BuildPostprocessor.cs:365)
UnityEditor.WebGL.WebGlBuildPostprocessor.PostProcess (UnityEditor.Modules.BuildPostProcessArgs args) (at /Users/bokken/buildslave/unity/build/PlatformDependent/WebGL/Extensions/Unity.WebGL.extensions/BuildPostprocessor.cs:910)
UnityEditor.Modules.DefaultBuildPostprocessor.PostProcess (UnityEditor.Modules.BuildPostProcessArgs args, UnityEditor.BuildProperties& outProperties) (at <7587a42c8322471cbc42b27c9b8eab3c>:0)
UnityEditor.PostprocessBuildPlayer.Postprocess (UnityEditor.BuildTargetGroup targetGroup, UnityEditor.BuildTarget target, System.String installPath, System.String companyName, System.String productName, System.Int32 width, System.Int32 height, UnityEditor.BuildOptions options, UnityEditor.RuntimeClassRegistry usedClassRegistry, UnityEditor.Build.Reporting.BuildReport report) (at <7587a42c8322471cbc42b27c9b8eab3c>:0)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr, Boolean&)

Build completed with a result of 'Failed' in 12 seconds (12242 ms)
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

UnityEditor.BuildPlayerWindow+BuildMethodException: 2 errors
  at UnityEditor.BuildPlayerWindow+DefaultBuildMethods.BuildPlayer (UnityEditor.BuildPlayerOptions options) [0x002ca] in <7587a42c8322471cbc42b27c9b8eab3c>:0 
  at UnityEditor.BuildPlayerWindow.CallBuildMethods (System.Boolean askForBuildLocation, UnityEditor.BuildOptions defaultBuildOptions) [0x00080] in <7587a42c8322471cbc42b27c9b8eab3c>:0 
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)